joosthooz commented on PR #14414:
URL: https://github.com/apache/arrow/pull/14414#issuecomment-1279372132

   This code seems to work, it is able to create an `ipc::IpcWriteOptions` with 
the compression field set, and pass it along with the dataset writer. The files 
written with e.g. lz4 are much smaller, so it seems to actually compress the 
data. However, there is something weird about the `compression` field (this is 
a `std::shared_ptr<util::Codec>` that is created in Python). I can set the 
field, but I cannot read it back (it will just return `None`).
   The other fields can be read back. Note that the code that is supposed to 
return the name of a Code already existed.


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